Display Panel and Manufacturing Method Thereof, and Display Device

ABSTRACT

The disclosure provides a display panel and a manufacturing method thereof. The display panel display panel comprises a first substrate and a second substrate which are assembled, the second substrate is provided with an organic electroluminescent device thereon, an anode layer of the organic electroluminescent device is away from the first substrate and a cathode layer thereof is closer to the first substrate than the anode layer; the cathode layer of the organic electroluminescent device is electrically connected to an auxiliary electrode on a light entering surface of the first substrate through multiple conductive spacers, the cathode layer is a transparent electrode layer; the auxiliary electrode has a resistance smaller than that of the cathode layer of the organic electroluminescent device; the auxiliary electrode is a grid-shaped auxiliary electrode and is provided in a non-display region, the auxiliary electrode is opaque and acts as a black matrix.

FIELD OF THE INVENTION

The present disclosure relates to the field of the display devicemanufacturing technology, and particular to a display panel and amanufacturing method thereof, and a display device.

BACKGROUND OF THE INVENTION

In recent years, the display technology has been developed rapidly, andespecially the organic electroluminescent device (OLED) displaytechnology has been developed rapidly. Currently, there are mainly twokinds of technologies for colorizing large-sized white organicelectroluminescent devices (WOLEDs), one of which is to form a displaypanel by directly manufacturing color filter patterns on a secondsubstrate (COA, color filter on array), and the other of which is toform a display panel by assembling a first substrate and a secondsubstrate, and providing spacers arranged spaced at certain intervalsbetween the first substrate and the second substrate, wherein thespacers are used to support the first substrate and the secondsubstrate.

SUMMARY OF THE INVENTION

An embodiment of the present disclosure provides a manufacturing methodof a display panel, including steps of: forming a pattern including anauxiliary electrode on a light entering surface of a first substrate bya patterning process; forming a pattern including conductive spacers onat least one of the auxiliary electrode and a cathode layer of a secondsubstrate by a patterning process; and assembling the first substrateand a second substrate, so that the auxiliary electrode is electricallyconnected to a cathode layer of an organic electroluminescent devicethrough the conductive spacers, wherein the cathode layer is atransparent electrode layer.

In some implementations, forming a pattern including conductive spacerson at least one of the auxiliary electrode and a cathode layer of asecond substrate by a patterning process includes:

forming a pattern including conductive spacers on the auxiliaryelectrode by a patterning process.

In some implementations, forming a pattern including conductive spacerson at least one of the auxiliary electrode and a cathode layer of asecond substrate by a patterning process includes:

forming a pattern including conductive spacers on the cathode layer ofthe second substrate at positions corresponding to the auxiliaryelectrode by a patterning process.

In some implementations, forming a pattern including conductive spacerson at least one of the auxiliary electrode and a cathode layer of asecond substrate by a patterning process includes:

forming a pattern including first conductive spacers on the auxiliaryelectrode by a patterning process, and forming a pattern includingsecond conductive spacers on the cathode layer of the second substrateat positions corresponding to the first conductive spacers by apatterning process.

In some implementations, assembling the first substrate and a secondsubstrate, so that the auxiliary electrode is electrically connected toa cathode layer of an organic electroluminescent device through theconductive spacers includes:

assembling the first substrate and the second substrate, so that theauxiliary electrode is electrically connected to the cathode layer ofthe organic electroluminescent device through the first conductivespacers and the second conductive spacers.

In some implementations, the auxiliary electrode has a resistancesmaller than that of the cathode layer of the organic electroluminescentdevice.

In some implementations, the conductive spacers are made of any one ofpolyacetylene, PPV, polythiophene, poly p-phenylene, polypyrrole,polyaniline, poly(3,4-ethylenedioxythiophene) or combination thereof.

In some implementations, a surface area of an end of the firstconductive spacer facing the second conductive spacer is smaller thanthat of an end of the second conductive spacer facing the firstconductive spacer.

In some implementations, the auxiliary electrode is formed as aplate-shaped auxiliary electrode which is transparent and conductive.

In some implementations, the plate-shaped auxiliary electrode is made ofany one of indium tin oxide, indium gallium zinc oxide, and indium zincoxide.

In some implementations, the auxiliary electrode is formed as agrid-shaped auxiliary electrode and provided in a non-display region.

In some implementations, the grid-shaped auxiliary electrode is made ofany one of Al, Mo, Cu, Ag, Cr and Au or a combination thereof.

In some implementations, the manufacturing method further including:forming a reflective layer below an anode layer of the organicelectroluminescent device, and the reflective layer is configured toreflect light emitted from the organic electroluminescent device to thecathode layer of the organic electroluminescent device.

An embodiment of the present disclosure provides a display panelincluding a first substrate and a second substrate which are assembled,wherein the second substrate is provided with an organicelectroluminescent device thereon, an anode layer of the organicelectroluminescent device is away from the first substrate and a cathodelayer thereof is closer to the first substrate than the anode layer; thecathode layer of the organic electroluminescent device is electricallyconnected to an auxiliary electrode on a light entering surface of thefirst substrate through a plurality of conductive spacers spaced, andthe cathode layer is a transparent electrode layer; and the auxiliaryelectrode has a resistance smaller than that of the cathode layer of theorganic electroluminescent device; wherein the auxiliary electrode is agrid-shaped auxiliary electrode and is provided in a non-display region,and the auxiliary electrode is opaque and acts as a black matrix.

In some implementations, the grid-shaped auxiliary electrode is made ofany one of Al, Mo, Cu, Ag, Cr and Au or a combination thereof.

An embodiment of the present disclosure provides display deviceincluding the above display panel.

An embodiment of the present disclosure provides display panel includinga first substrate and a second substrate which are assembled, whereinthe second substrate is provided with an organic electroluminescentdevice thereon, an anode layer of the organic electroluminescent deviceis away from the first substrate and a cathode layer thereof is closerto the first substrate than the anode layer; the cathode layer of theorganic electroluminescent device is electrically connected to anauxiliary electrode on a light entering surface of the first substratethrough a plurality of conductive spacers spaced, and the cathode layeris a transparent electrode layer; and the auxiliary electrode has aresistance smaller than that of the cathode layer of the organicelectroluminescent device; wherein the auxiliary electrode includes aplurality of bar-shaped auxiliary electrodes connected to each otherthrough at least one connection stripe.

In some implementations, the bar-shaped auxiliary electrode is made ofany one of Al, Mo, Cu, Ag, Cr and Au or a combination thereof.

An embodiment of the present disclosure provides display deviceincluding the above display panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of a display panel in the prior art;

FIG. 2 is a structural diagram of a display panel according toembodiment 1 of the disclosure;

FIG. 3 a top view of an auxiliary electrode, which is a grid-shapedauxiliary electrode, of the display panel according to embodiment 1 ofthe disclosure;

FIG. 4 is another structural diagram of a display panel according toembodiment 1 of the disclosure; and

FIG. 5 is a structural diagram of a display panel manufactured by amanufacturing method of a display panel according to embodiment 4 of thedisclosure.

Reference signs: 101 first substrate; 102 second substrate; 103 thinfilm transistor; 104 pixel electrode layer (anode layer); 105 lightemitting layer; 106 cathode layer; 107 (conductive) spacer; 1071 firstconductive spacer; 1072 second conductive spacer; 108 black matrix; 109color filter pattern; 110 planarization layer; 111 (plate/grid-shaped)auxiliary electrode.

DETAILED DESCRIPTION OF EMBODIMENTS

In order to make persons skilled in the art better understand thesolutions of the disclosure, the disclosure will be described below indetail in conjunction with drawings and embodiments.

As shown in FIG. 1, for a display panel consisting of a second substrate102 and a first substrate 101, the first substrate 101 includes blackmatrixes 108, color filter patterns 109 of various colors provided abovethe black matrixes 108, and a planarization layer 110 provided above theblack matrixes 108 and the color filter patterns 109 of various colors;a drain of a thin film transistor 103 on the second substrate 102 iselectrically connected to an anode layer 104 of an organicelectroluminescent device, the anode layer 104 is provided at one sideclose to the second substrate 102, a cathode layer 106 of the organicelectroluminescent device is provided at one side far away from thesecond substrate 102, a light emitting layer 105 is provided between theanode layer 104 and the cathode layer 106, and a plurality of organicelectroluminescent devices are provide on the second substrate 102, theanode layers 104 of the organic electroluminescent devices arecontrolled by different thin film transistors 103 respectively, all ofthe cathode layers 106 are connected together, spacers 107 supports thefirst substrate 101 and the second substrate 102 therebetween, at thistime, light emitted from the organic electroluminescent devicestransmits the cathode layer 106, that is to say, the organicelectroluminescent device is of a top-emitting type, the cathode layer106 is commonly made of conductive material such as silver (Ag) andaluminium (Al), light transmission of which is low, thus it is requiredto select very thin conductive material so that light may transmit. Itshould be noted that, after the first substrate 101 and the secondsubstrate 102 are manufactured separately, the first substrate 101 andthe second substrate 102 are assembled to form a display panel, whereinthe spacers 106 may formed on the first substrate 101 or on the secondsubstrate 102.

The inventor finds that, in the organic electroluminescent device oftop-emitting type adopted in the above display panel, the cathode layer106 is thin due to requirement on transmittance, resulting in the factthat the cathode layer 106 has large resistance, and poor conductivity,therefore the light emitting performance of the organicelectroluminescent device is poor, and the display effect is nonuniform.

Embodiment 1

As shown in FIGS. 2, 3, 4 and 5, the present embodiment provides adisplay panel, which comprises a first substrate 101 and a secondsubstrate 102 which are assembled, the second substrate 102 is providedwith organic electroluminescent devices thereon, an anode layer 104 ofthe organic electroluminescent device is far away from the firstsubstrate 101 and an cathode layer 106 thereof is close to the firstsubstrate 101; and the cathode layer 106 of the organicelectroluminescent device is electrically connected to an auxiliaryelectrode 111 on a light entering surface of the first substrate 101through a plurality of conductive spacers 107 spaced at certainintervals, wherein the cathode layer 106 is a transparent electrodelayer.

The second substrate 102 of the display panel of the embodiment includesa plurality of organic electroluminescent devices, an anode layer 104 ofeach of the organic electroluminescent devices is separately controlledby a separated thin film transistor 103, cathode layers 106 of all ofthe organic electroluminescent devices are connected together, and thelight entering surface of the first substrate 101 is provided with theauxiliary electrode 111, which is electrically connected to the cathodelayers 106 of the organic electroluminescent devices through theconductive spacers 107 so as to improve the conductivity of the cathodelayers 106, and thus improve the luminance uniformity of the displaypanel.

Preferably, the auxiliary electrode 111 has a resistance smaller thanthat of the cathode layer 106 of the organic electroluminescent device,thus an IR drop of the cathode layer 106 may be prevented or decreased,the conductivity of the cathode layer 106 is enhanced due to theauxiliary electrode, and thus the luminance uniformity of the displaypanel may be improved.

The conductive spacer 107 is preferably made of any one ofpolyacetylene, PPV, polythiophene, poly p-phenylene, polypyrrole,polyaniline, poly(3,4-ethylenedioxythiophene) or combination thereof. Ofcourse, the disclosure is not limited thereto. The conductive spacer 107may be made of any other material, so long as it is conductive and playsa supporting role.

The conductive spacer 107 may be of an integrated structure, and may beprovided on the first substrate 101 or the second substrate 102 forsupporting the first substrate 101 and the second substrate 102 whenassembled. The conductive spacer 107 may preferably include, as shown inFIG. 5, a first conductive spacer 1071 and a second conductive spacer1072 which are connected to each other, for example, the firstconductive spacer 1071 is provided on the first substrate 101, and thesecond conductive spacer 1072 is provided on the second substrate 102,and a surface area of an end of the first conductive spacer 1071 towardsthe second conductive spacer 1072 is smaller than that of an end of thesecond conductive spacer 1072 towards the first conductive spacer 1071.At this time, compared to the integrated conductive spacer 107, theheight of the first conductive spacer 1071 or the second conductivespacer 1072 is relatively small, therefore, the first conductive spacer1071 and the second conductive spacer 1072 are easily manufactured, andsince the surface area of an end of the first conductive spacer 1071towards the second conductive spacer 1072 is smaller than that of an endof the second conductive spacer 1072 towards the first conductive spacer1071, the first substrate 101 and the second substrate 102 are assembledmore stably. It should be noted that, it is possible to make the surfacearea of an end of the first conductive spacer 1071 towards the secondconductive spacer 1072 be larger than that of an end of the secondconductive spacer 1072 towards the first conductive spacer 1071, and itcan be easily conceived that the stability of the assemblage of thefirst substrate 101 and the second substrate 102 with the support of thefirst conductive spacer 1071 and the second conductive spacer 1072 canbe ensured, so long as one of surface areas of contacting surfaces ofthe first conductive spacer 1071 and the second conductive spacer 1072is made be larger than the other one.

The auxiliary electrode 111 is preferably a plate-shaped auxiliaryelectrode 111 which is transparent and conductive. The plate-shapedauxiliary electrode 111 is made of any one of indium tin oxide, indiumgallium zinc oxide, and indium zinc oxide, and of course, othertransparent materials are also possible.

As shown in FIG. 3, the auxiliary electrode 111 is preferably agrid-shaped auxiliary electrode and provided in a non-display region(that is, regions corresponding to the black matrixes 108 on the firstsubstrate 101), and may be preferably made of any one of Al, Mo, Cu, Ag,Cr and Au or combination thereof. Of course, any other conductivematerial with low resistance is possible, and the thickness of theauxiliary electrode 111 is in a range of 50-300nm. At this time, thegrid-shaped auxiliary electrode 111 is preferably made of opaqueconductive material, and in this case, it is possible that no blackmatrix 108 is provided on the first substrate 101, and the grid-shapedauxiliary electrode 111 acts as the black matrix 108, the resistance ofthe material of the grid-shaped auxiliary electrode 111 is lower thanthat of the cathode, which may improve the conductivity of the cathodelayer 106. Of course, bar-shaped auxiliary electrodes 111 are alsopossible and provided in the non-display region, and all of thebar-shaped auxiliary electrodes may be electrically connected to eachother through at least one connection stripe.

Preferably, a reflective layer is provided below the anode layer 104 ofthe organic electroluminescent device, and the reflective layer is usedto reflect light emitted from the organic electroluminescent device tothe cathode layer 106 of the organic electroluminescent device.Specifically, the reflective layer may be provided on the anode layer104 of the organic electroluminescent device at a side far away from thefirst substrate 101, but position of the reflective layer is not limitedthereto. The reflective layer may be made of a reflective material, suchas Ag and Al. Since light frequently transmits the anode layer 104, byadding the reflective layer, light incident onto the anode layer 104 maybe reflected to the cathode layer side, and outgoes from the cathodelayer 106 of the organic electroluminescent device, therefore,utilization of the emergent light of the organic electroluminescentdevice may be increased, and in a case of other conditions being thesame, power consumption of the organic electroluminescent device may bereduced.

Preferably, the organic electroluminescent device is an organicelectroluminescent device emitting white light. As to the whitelight-emitting organic electroluminescent device, patterns 109 of redfilter, green filter and blue filter are provided on the first substrate101 at a side close to the second substrate 102, and of course, theorganic electroluminescent device may preferably be an organicelectroluminescent device emitting red light, green light or blue light.

It should be noted that, in the above description of the presentembodiment, in order to better understand the disclosure, description ismade by taking the first substrate 101 being a color filter substrateand the second substrate 102 being an array substrate as an example.However, the disclosure is not limited thereto, for example, the organicelectroluminescent device may be a colorized organic electroluminescentdevice, which can emit red light, green light or blue light, at thistime, it is unnecessary to manufacture the color filter patterns 109,and the first substrate 101 may be a transparent substrate and assembledwith the second substrate 102 to form a display panel.

Embodiment 2

The present embodiment provides a manufacturing method of a displaypanel, which comprises following steps:

Step 1, forming a pattern including an auxiliary electrode 111 on alight entering surface of a first substrate 101 by a patterning process.

Step 2, forming a pattern including conductive spacers 107 on theauxiliary electrode 111 by a patterning process; and

Step 3, assembling the first substrate 101 and a second substrate 102,so that the auxiliary electrode 111 is electrically connected to cathodelayers 106 of organic electroluminescent devices through the conductivespacers 107, wherein the cathode layer 106 is a transparent electrodelayer.

Specifically, first, black matrixes (BM) are formed on a first base bycoating, exposure, development and baking processes and the like, red(R), green (G) and blue (B) color filter patterns 109 are formed abovethe black matrixes 108 respectively by coating, exposure, developmentand baking processes and the like, then a planarization layer 110 iscoated, and a layer of metal or metal oxide is deposited on theplanarization layer 110 by sputtering, Plasma Enhanced Chemical VaporDeposition (PECVD) method, evaporation or the like and then a patterningprocess is performed thereon to form a pattern including the auxiliaryelectrode 111, and conductive spacers 107 are formed above the auxiliaryelectrode 111 by a patterning process. In a case of the auxiliaryelectrode 111 being made of a transparent material, it may beplate-shaped or of other shape. In a case of the auxiliary electrode 111being made of an opaque material, in order to enable light to transmit,the auxiliary electrode 111 is preferably grid-shaped and provided in anon-display region so as to ensure light emitted from the organicelectroluminescent devices may transmit the first substrate 101, at thistime, it is possible that no black matrix 108 is provided on the firstsubstrate 101. Of course, it is also possible that the auxiliaryelectrode 111 may be formed as bar-shaped auxiliary electrodes, and allof the bar-shaped auxiliary electrodes are electrically connectedtogether through at least one connection stripe.

The plate-shaped auxiliary electrode 111 is made of any one of indiumtin oxide, indium gallium zinc oxide, and indium zinc oxide, or may bemade of other transparent conductive material. The grid-shaped auxiliaryelectrode 111 may be made of any one of aluminium (Al), molybdenum (Mo),copper (Cu), silver (Ag), chrome (Cr) and gold (Au) or combinationthereof, of course, material of the plate-shaped auxiliary electrode isnot limited thereto, other opaque conductive materials are possible, andthe plate-shaped auxiliary electrode may have a thickness of 50-300nm.

The conductive spacer 107 may be made of a conductive organic material,such as polyacetylene, PPV (Poly-(P-phenylenevinyle)), PTH(polythiophenes), PPP (poly p-phenylene), PPy (polypyrroles), PANI(polyaniline), PEDOT (poly(3,4-ethylenedioxythiophene)) or combinationthereof.

Next, a gate is formed on a second base by sputtering, exposure,development, etching, peeling off processes and the like, a gateinsulation layer is formed above the gate by a plasma enhanced chemicalvapor deposition method and the like, an active layer of oxidesemiconductor is formed above the gate insulation layer by sputtering,exposure, development, etching, peeling off processes and the like, anetch stopper layer (ESL) is formed above the active layer by sputtering,exposure, development, etching, peeling off processes and the like, adrain and a source are formed above the etch stopper layer bysputtering, exposure, development, etching, peeling off processes andthe like so that the drain and the source are connected to the activelayer of oxide semiconductor through contact vias passing through theetch stopper layer, a passivation protection layer is formed above thedrain and the source, a pixel electrode layer 104 is formed above thepassivation protection layer so that the pixel electrode layer 104 isconnected to the drain through a via passing through the passivationprotection layer, a pixel defining layer (PDL) is formed above the pixelelectrode layer 104 which is the anode layer 104 of the organicelectroluminescent device, and a light emitting layer 105 and a cathodelayer 106 required for the light emitting layer 105 are evaporated onthe pixel electrode layer 104.

The gate may be of a single-layered structure or a multilayeredcomposite laminated structure made of one or more of molybdenum (Mo),alloy of molybdenum and niobium (MoNb), aluminum (Al), alloy of aluminumand neodymium (AlNd), titanium (Ti) and copper (Cu), and preferably isof a single-layered structure or a multilayered composite laminatedstructure made of Mo, Al or alloy containing Mo and Al. Thickness of thegate is 100 nm˜500 nm.

In the present embodiment, the gate insulation layer may be amultilayered composite film made of one or two of silicon oxide (SiOx),silicon nitride (SiNx), hafnium oxide (HfOx), silicon nitrogen oxide(SiON) and aluminum oxide (AlOx), and, and thickness thereof iscontrolled to be about 100˜600 nm and adjustable as desired.

The active layer of oxide semiconductor may be a thin film made ofelements including Indium (In), gallium (Ga), zinc (Zn), oxygen (O),stannum (Sn) etc. and is formed by sputtering, wherein the thin filmmust be made of oxygen element and two or more of the above elements,such as indium gallium zinc oxide (IGZO), indium zinc oxide (IZO),indium tin oxide (InSnO), indium gallium stannum oxide (InGaSnO) and thelike. The active layer of oxide semiconductor is preferably made of IGZOand IZO, and thickness thereof is preferably 10˜100 nm.

The etch stopper layer may be made of a material, such as SiOx, SiNx,HfOx, SiON, AlOx etc. and may be a multilayered film made of two orthree of the above materials.

The source and the drain may be a single-layered structure or amultilayered composite laminated structure made of one or more of Mo,MoNb, Al, AlNd, Ti and Cu, and preferably is of a single-layered film ora multilayered composite film made of Mo, Al or alloy containing Mo andAl.

The passivation protection layer may be made of one of SiOx, SiNx, HfOx,SiON, AlOx and organ materials or combination thereof.

The pixel electrode layer 104, i.e., the anode layer 104 of the organicelectroluminescent device, may be made of ITO (indium tin oxide), ofcourse it also may be made of other transparent conductive material.Since the pixel electrode layer 104 is transparent, it is necessary toprovide a reflective layer under the anode layer 104 to reflect lightemitted from the organic electroluminescent device to the cathode layer106 side, and the reflective layer may be made of a reflective metalmaterial such as Ag.

The pixel defining layer may be an organic insulating layer with lowermoisture and has photosensitive property similar to that of the commonphotoresist.

The light emitting layer 105 is made of an organ material, which isdetermined as desired.

The cathode layer 106 may be made of a metal material with low workfunction, such as Al or Ag, and is thin enough to enable light totransmit.

Finally, the resultant first substrate 101 and the resultant secondsubstrate 102 are encapsulated to form a display panel.

It should be noted that, there is no sequencing for manufacturing thefirst substrate 101 and manufacturing the auxiliary electrode 111 andthe conductive spacers 107 on the first substrate 101, and manufacturingthe second substrate 102 (including the thin film transistors 103 andthe organic electroluminescent devices thereon), the above descriptionis just an example, and it is also possible to first manufacture thesecond substrate 102, then manufacture the first substrate 101 andmanufacture the auxiliary electrode 111 and the conductive spacers 107on the first substrate 101.

In the display panel manufactured by the manufacturing method providedby the present embodiment, the cathode layer 106 thereof is connected tothe auxiliary electrode 111 through the conductive spacers 107, and theconductivity of the cathode layer 106 is improved significantly, andthus the luminance uniformity of the display panel is improved.

It should be noted that, in the present embodiment, the first substrate101 is a color filter substrate, and the second substrate 102 is anarray substrate, but the disclosure is not limited thereto. For example,when the manufactured organic electroluminescent device is a colorizedorganic electroluminescent device which may emit red light, green lightor blue light, it is unnecessary to manufacture color filter patterns109, and at this time, the first substrate 101 may be a transparentsubstrate, and a display panel may be formed by assembling the firstsubstrate 101 and the second substrate 102. The above structures may beset as desired.

Embodiment 3

The present embodiment provides a manufacturing method of a displaypanel, which comprises following steps:

Step 1, forming a pattern including an auxiliary electrode on a lightentering surface of a first substrate 101 by a patterning process.

Step 2, forming a pattern including conductive spacers 107 on a cathodelayer 106 of a second substrate 102 at positions corresponding to theauxiliary electrode 111 by a patterning process.

Step 3, assembling the first substrate 101 and a second substrate 102,so that the auxiliary electrode 111 is electrically connected to thecathode layer 106 of the organic electroluminescent device through theconductive spacers 107, wherein the cathode layer 106 is a transparentelectrode layer.

It should be noted that, the sequence of the step 1 and the step 2 maybe reversed, that is to say, it is also possible to form the conductivespacers 107 on the cathode layer 106 of the second substrate 102 first,then form the auxiliary electrode 111 on a light entering surface of afirst substrate 101 at positions corresponding to the conductive spacers107.

In the manufacturing method of a display panel provide by the presentembodiment, the conductive spacers 107 are provided on the secondsubstrate 102, other procedures are the same as those in themanufacturing method of a display panel provide by the embodiment 1, andwill not be repeatedly described herein.

In the display panel manufactured by the manufacturing method providedby the present embodiment, the cathode layer thereof is connected to theauxiliary electrode 111 through the conductive spacers 107, theconductivity of the cathode layer 106 is improved remarkably, and thusthe luminance uniformity of the display panel is improved.

Embodiment 4

As shown in FIG. 5, the present embodiment provides a manufacturingmethod of a display panel, which comprises following steps.

Step 1, forming a pattern including an auxiliary electrode on a lightentering surface of a first substrate 101 by a patterning process, andforming a pattern including first conductive spacers 1071 on theauxiliary electrode 111 by a patterning process.

Step 2, forming a pattern including second conductive spacers 1072 on acathode layer 106 of a second substrate 102 at positions correspondingto the first conductive spacers 1071 by a patterning process.

Step 3, assembling the first substrate 101 and a second substrate 102,so that the auxiliary electrode 111 is electrically connected to thecathode layers 106 of the organic electroluminescent device through thefirst conductive spacers 1071 and the second conductive spacers 1072,wherein the cathode layer 106 is a transparent electrode layer. Adisplay panel as shown in FIG. 5 is obtained.

It should be noted that, the sequence of the step 1 and the step 2 maybe reversed, that is to say, it is also possible to form the secondconductive spacers 1072 on the second substrate 102 first, and then formthe first conductive spacers 1071 above the auxiliary electrode 111 onthe light entering surface of the first substrate 101 at positionscorresponding to the second conductive spacers 1072.

In the manufacturing method of a display panel provide by the presentembodiment, the conductive spacer 107 is divided into a first conductivespacer 1071 and a second conductive spacer 1072, which are manufacturedon the first substrate 101 and the second substrate 102 respectively, atthis time, compared to the height of the conductive spacer 107 in theembodiment 1 or 2, the height of the first conductive spacer 1071 or thesecond conductive spacer 1072 in the present embodiment is lower, thusthe first conductive spacer 1071 and the second conductive spacer 1072are easy to be manufactured. One of the first conductive spacer 1071 andthe second conductive spacer 1072 is wider than the other one, that is,the surface area of an end of one of the first conductive spacer 1071and the second conductive spacer 1072 towards the other one of the firstconductive spacer 1071 and the second conductive spacer 1072 is largerthan that of an end of the other one towards the one, so that the firstsubstrate 101 and the second substrate 102 are assembled more stably.Other manufacturing procedures of the manufacturing method of thepresent embodiment are the same as those in the embodiment 1, and willnot be repeatedly described herein. Of course, in the presentembodiment, the first conductive spacer 1071 and the second conductivespacer 1072 may also be manufactured on the first substrate 101 and thesecond substrate 102 respectively, and manufacturing procedures thereofare the same as the above case in the present embodiment, and will notbe repeatedly described herein.

In the display panel manufactured by the manufacturing method providedby the present embodiment, the cathode layer 106 thereof is connected tothe auxiliary electrode 111 through the first conductive spacers 1071and the second conductive spacers 1072, the conductivity of the cathodelayer 106 is improved significantly, and thus the luminance uniformityof the display panel is improved.

Embodiment 5

The present embodiment provides a display device comprising the displaypanel of the embodiment 1. The display device may be any product orcomponent with display function, such as a mobile phone, a tabletcomputer, a TV, a display, a notebook computer, a digital image frame, anavigator.

In the display device comprising the display panel of the embodiment 1,the cathode layer thereof is connected to the auxiliary electrode 111through the conductive spacers 107, the conductivity of the cathodelayer 106 is improved significantly, the luminance uniformity of thedisplay panel is improved, and thus the display effect of the displaydevice is excellent.

Of course, the display device of the present embodiment may furthercomprise other conventional structures, such as a power supply unit, adisplay driving unit and the like.

It should be understood that, the above embodiments are only exemplaryembodiments employed to illustrate the principle of the disclosure, andthe disclosure is not limited thereto. Persons skilled in the art canmake various modifications and improvements without departing from theprinciple and substance of the disclosure, and these modifications andimprovements should be considered to be within the protection scope ofthe disclosure.

1. A manufacturing method of a display panel, comprising steps of: forming a pattern including an auxiliary electrode on a light entering surface of a first substrate by a patterning process; forming a pattern including conductive spacers on at least one of the auxiliary electrode and a cathode layer of a second substrate by a patterning process; and assembling the first substrate and a second substrate, so that the auxiliary electrode is electrically connected to a cathode layer of an organic electroluminescent device through the conductive spacers, wherein the cathode layer is a transparent electrode layer.
 2. The manufacturing method of claim 1, wherein forming a pattern including conductive spacers on at least one of the auxiliary electrode and a cathode layer of a second substrate by a patterning process comprises: forming a pattern including conductive spacers on the auxiliary electrode by a patterning process.
 3. The manufacturing method of claim 1, wherein forming a pattern including conductive spacers on at least one of the auxiliary electrode and a cathode layer of a second substrate by a patterning process comprises: forming a pattern including conductive spacers on the cathode layer of the second substrate at positions corresponding to the auxiliary electrode by a patterning process.
 4. The manufacturing method of claim 1, wherein forming a pattern including conductive spacers on at least one of the auxiliary electrode and a cathode layer of a second substrate by a patterning process comprises: forming a pattern including first conductive spacers on the auxiliary electrode by a patterning process, and forming a pattern including second conductive spacers on the cathode layer of the second substrate at positions corresponding to the first conductive spacers by a patterning process.
 5. The manufacturing method of claim 4, wherein assembling the first substrate and a second substrate, so that the auxiliary electrode is electrically connected to a cathode layer of an organic electroluminescent device through the conductive spacers comprises: assembling the first substrate and the second substrate, so that the auxiliary electrode is electrically connected to the cathode layer of the organic electroluminescent device through the first conductive spacers and the second conductive spacers.
 6. The manufacturing method of claim 4, wherein the auxiliary electrode has a resistance smaller than that of the cathode layer of the organic electroluminescent device.
 7. The manufacturing method of claim 1, wherein the conductive spacers are made of any one of polyacetylene, PPV, polythiophene, poly p-phenylene, polypyrrole, polyaniline, poly(3,4-ethylenedioxythiophene) or combination thereof.
 8. The manufacturing method of claim 4, wherein a surface area of an end of the first conductive spacer facing the second conductive spacer is smaller than that of an end of the second conductive spacer facing the first conductive spacer.
 9. The manufacturing method of claim 1, wherein the auxiliary electrode is formed as a plate-shaped auxiliary electrode which is transparent and conductive.
 10. The manufacturing method of claim 9, wherein the plate-shaped auxiliary electrode is made of any one of indium tin oxide, indium gallium zinc oxide, and indium zinc oxide.
 11. The manufacturing method of claim 1, wherein the auxiliary electrode is formed as a grid-shaped auxiliary electrode and provided in a non-display region.
 12. The manufacturing method of claim 11, wherein the grid-shaped auxiliary electrode is made of any one of Al, Mo, Cu, Ag, Cr and Au or a combination thereof.
 13. The manufacturing method of claim 1, further comprising: forming a reflective layer below an anode layer of the organic electroluminescent device, and the reflective layer is configured to reflect light emitted from the organic electroluminescent device to the cathode layer of the organic electroluminescent device.
 14. A display panel comprising a first substrate and a second substrate which are assembled, wherein the second substrate is provided with an organic electroluminescent device thereon, an anode layer of the organic electroluminescent device is away from the first substrate and a cathode layer thereof is closer to the first substrate than the anode layer; the cathode layer of the organic electroluminescent device is electrically connected to an auxiliary electrode on a light entering surface of the first substrate through a plurality of conductive spacers spaced, and the cathode layer is a transparent electrode layer; and the auxiliary electrode has a resistance smaller than that of the cathode layer of the organic electroluminescent device; wherein the auxiliary electrode is a grid-shaped auxiliary electrode and is provided in a non-display region, and the auxiliary electrode is opaque and acts as a black matrix.
 15. The display panel of claim 14, wherein the grid-shaped auxiliary electrode is made of any one of Al, Mo, Cu, Ag, Cr and Au or a combination thereof.
 16. A display panel comprising a first substrate and a second substrate which are assembled, wherein the second substrate is provided with an organic electroluminescent device thereon, an anode layer of the organic electroluminescent device is away from the first substrate and a cathode layer thereof is closer to the first substrate than the anode layer; the cathode layer of the organic electroluminescent device is electrically connected to an auxiliary electrode on a light entering surface of the first substrate through a plurality of conductive spacers spaced, and the cathode layer is a transparent electrode layer; and the auxiliary electrode has a resistance smaller than that of the cathode layer of the organic electroluminescent device; wherein the auxiliary electrode comprises a plurality of bar-shaped auxiliary electrodes connected to each other through at least one connection stripe.
 17. The display panel of claim 16, wherein the bar-shaped auxiliary electrode is made of any one of Al, Mo, Cu, Ag, Cr and Au or a combination thereof.
 18. A display device comprising the display panel of claim
 14. 19. A display device comprising the display panel of claim
 16. 